Koch acquired 100% of O'Bannon on January 1, 2016. The transaction was not a bargain purchase. On the acquisition date, O'Bannon's Inventory had a book value of 37,000 and a fair value of 58,000. No intercompany inventory transaction occurred during 2016. Koch and O'Bannon both use the FIFO inventory cost flow assumption. O'Bannon's inventory turns over approximately 10 times per year.

What AAP adjustment to Cost of Goods Sold must be made when preparing Koch's consolidated financial statements for 2016?